Description: Map showing the moraine of the Green Bay glacier, including the drift bearing area, the generalized directions of glacial movement, the direction of glacial striae, and the locations of prominent terminal moraines, the Quartzite and Porphyry Knobs. Map referenced to Julius Bien and Co. lith. "The moraine of the Green Bay glacier parts from that of the Lake Michigan lobe near the northwestern corner of Walworth County, about 20 miles north of the southern limit of Wisconsin, and about 45 miles west of Lake Michigan. From this point a common intermediate moraine, formed jointly by the action of the Lake Michigan and Green Bay glaciers, extends northerly and northeasterlyÉ" — Chamberlin, 1882
Source: Thomas C. Chamberlin, United States Geological Survey Annual Report, 3rd (Washington, DC: United States Geological Survey, 1882) PL.XXIX
Map Credit: Courtesy the private collection of Roy Winkelman |
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